78234140 has 24 divisors (see below), whose sum is σ = 166274640. Its totient is φ = 30915968.

The previous prime is 78234137. The next prime is 78234181. The reversal of 78234140 is 4143287.

It is a super-2 number, since 2×78234140² = 12241161323079200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21905 + ... + 25224.

It is an arithmetic number, because the mean of its divisors is an integer number (6928110).

Almost surely, 2^78234140 is an apocalyptic number.

It is an amenable number.

78234140 is an abundant number, since it is smaller than the sum of its proper divisors (88040500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78234140 is a wasteful number, since it uses less digits than its factorization.

78234140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47221 (or 47219 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 78234140 is about 8845.0065008455. The cubic root of 78234140 is about 427.6929626018.

The spelling of 78234140 in words is "seventy-eight million, two hundred thirty-four thousand, one hundred forty".